Grokking Node.js Design Patterns for Interviews/

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Solution: Inject Configuration into a Decorator

Solution: Inject Configuration into a Decorator

Build a decorator factory that injects a configurable prefix into log messages for different modules.

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Solution explanation

  • Lines 2–6: We define fetchOrder, a mock async function representing a service call. It resolves with an order object after a short delay.

  • Lines 9–18: We create createLogger(prefix), a decorator factory.

    • It accepts a prefix string and returns a new decorator function.

    • That decorator wraps any target function and logs both before and after ...